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Belt driving apparatus having belt with detection marks

a technology of detection marks and driving apparatus, which is applied in the direction of electrographic process apparatus, instruments, optics, etc., can solve the problems of superfluous material cost and assembly cost, affecting and affecting the quality of the printed pattern. , to achieve the effect of reducing the degree of breakag

Inactive Publication Date: 2012-12-04
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an image forming apparatus that can reduce breakage from the end of processed line-like marks caused by tension of the belt. This is achieved by tilting the marks from the rotational axis direction of the belt at least at the end portions close to the end surface of the belt, and controlling the rotation of the belt based on the detection of the marks.

Problems solved by technology

The intermediary transfer belt is formed in a thin film shape by using a high-rigidity resin material, thus being liable to cause peeling of a print pattern by nature.
Further, when a diameter of the rotatable supporting member is decreased with a decreasing size of the image forming apparatus, repetitive stress acting on a print interface is increased, so that the print pattern is further liable to be peeled off.
Compared with the case of the direct printing method, this application method entails superfluous material cost and assembly cost.
However, when the intermediary transfer belt on which the line-like marks had been formed by using the laser machining was subjected to a continuous image formation, it turned out that a frequency of breakage of the intermediary transfer belt in a short period was increased compared with the intermediary transfer belt on which the line-like marks were not formed.

Method used

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  • Belt driving apparatus having belt with detection marks
  • Belt driving apparatus having belt with detection marks
  • Belt driving apparatus having belt with detection marks

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0076]FIG. 5 is an illustration of a scale in Embodiment 1. FIG. 6 is a schematic view showing a cross-section of the intermediary transfer belt in a state in which the intermediary transfer belt is wound (stretched) around a tension roller. FIGS. 7(a) and 7(b) are enlarged views each showing a single line-like mark constituting the scale.

[0077]As shown in FIG. 5, the scale 7 in Embodiment 1 has a shape of an outer appearance such that each of the line-like marks is obliquely bent so that one end of a rectilinear line perpendicular to the intermediary transfer belt rotational direction is bent through a curved line. Specifically, a contour of each line-like mark is formed by smoothly connecting a non-parallel portion 7b obliquely tilted from the direction perpendicular to the intermediary transfer belt rotational direction to a parallel portion 7a perpendicular to the intermediary transfer belt rotational direction through an arcuate segment. That is, the scale 7 is consisting of th...

modified embodiment

[0096]FIGS. 8(a) to 8(c) are illustrations each showing a modified embodiment of the scale 7 in Embodiment 1.

[0097]As shown in FIG. 5, in Embodiment 1, the scale 7 having such a shape that the parallel portion 7a parallel to the belt widthwise direction is smoothly connected with the non-parallel portion 7b obliquely tilted with respect to the belt widthwise direction is described.

[0098]Similarly as in the case of the scale 7 in Embodiment 1, compared with a comparative embodiment as shown in FIG. 7(a), the stress concentration at the end portion of the scale can also be alleviated with respect to scales 7B, 7C and 7D.

[0099]The scale 7B in the modified embodiment shown in FIG. 8(a) has a shape such that the parallel portion 7a parallel to the belt widthwise direction is smoothly connected with a non-parallel portion 7b tilted by 90 degrees with respect to the parallel portion 7a.

[0100]The scale 7C in the modified embodiment shown in FIG. 8(b) has a shape such that the parallel port...

embodiment 2

[0102]FIG. 9 is an illustration of control of a rotational speed of an intermediary transfer belt in Embodiment 2. FIG. 10 is an illustration of a scale in Embodiment 2. FIG. 11 is an illustration of a tilting direction of the scale in Embodiment 2.

[0103]As shown in FIG. 9, the scale 7 in Embodiment 2 has an outer shape such that all the respective line-like marks are rectilinear and arranged so as to be tilted with the same tilting angle at both end portions of the belt member. That is, the scale 7 is formed at the both end portions of the intermediary transfer belt 106 so as to be tilted obliquely from the direction perpendicular to the belt rotational direction as a whole.

[0104]In the neighborhood of both edges of the intermediary transfer belt 106, a pair of scales 7 is provided by the laser machining and a pair of optical sensors 8a and 8b is provided correspondingly to the scales 7. The line-like marks are optically detected by the detecting means (8a, 8b), and a rotational sp...

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PUM

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Abstract

An image forming apparatus includes a rotatable belt member; a stretching roller for stretching the belt member; a plurality of line like marks which are arranged in a rotational direction of the belt member and are formed stepwisely on a surface of the belt member, the marks being tilted from a rotational axis direction of the belt member at least at end portions thereof on sides close to an end surface of the belt member; and control means for controlling rotation of the belt member on the basis of a result of detection of the marks.

Description

FIELD OF THE INVENTION AND RELATED ART[0001]The present invention relates to an image forming apparatus in which line-like marks arranged at an end portion of a belt member are optically detected to effect rotational speed control. Specifically, the present invention relates to an outer configuration of each of the line-like marks.[0002]The image forming apparatus in which the belt member (an intermediary transfer belt or a recording material conveyer belt) is used to perform transfer of a toner image has been used widely. Such a belt member is stretched around a plurality of rotatable supporting members and is rotated in a tension state, thus being speed-controlled precisely.[0003]With respect to the speed control of the belt member control such that a rotational speed of a rotatable supporting member is adjusted depending on an output of optical detection of line-like marks formed on the belt member, such has been put into practical use (Japanese Laid-Open Patent Application (JP-A...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G03G15/01
CPCG03G15/161G03G15/1605G03G2215/00139
Inventor NAKAGAKI, JUNSHIRAKATA, JIROMAEDA, YORITSUGUATARASHI, SATOSHIFUJIWARA, YUKIHIROKANAI, DAINAKAZATO, JUN
Owner CANON KK